Oxide ion conductivity, phase transitions, and phase separation in fluorite-based Bi 38-x Mo 7+xO78+1.5x
We present, for the first time, the ionic conductivity properties of two different, but closely related, bismuth molybdates: Bi38Mo 7O78 and Bi37.5Mo7.5O 78.75. Both are good oxide ion conductors, with the latter being comparable to yttria-stabilized zirconia. We show that the structure of Bi 38Mo7O78 is more complex than previously reported, and that this compound is a 5×3×6 fluorite superstructure with slight monoclinic distortion. In addition to being a good oxide ion conductor, the material...[Show more]
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